question

change to ies

answer

y

question

reference point

answer

A ___ is a starting point used to describe the position of an object.

question

reference direction

answer

The ___ is the direction you must travel from the reference point toward an object.

question

meters

answer

Units like ___ (m), kilometers (km), and centimeters (cm) are used to describe distances.

question

reference direction

answer

To describe an object’s position, you must include three pieces of information: a reference point, a reference direction, and the distance from the reference point in the ___.

question

negative

answer

Positive (+)and ___ (-) measurements of distance are often used to describe positions

question

Positive

answer

___ measurements are usually in the reference direction, or toward the object from the reference point.

question

opposite

answer

Negative measurements are usually in the opposite direction from the reference direction.Negative measurements are usually in the ___ direction from the reference direction.They start from the reference point and measure away from the object

question

arrow

answer

One way to describe the position of an object is as an ___ pointing from a reference point toward the object

question

vector

answer

A ___ is a quantity that has both a size and a direction

question

arrows

answer

Vectors are often drawn as ___ pointing away from a reference point in the referencedirection.

question

Position

answer

___ is one example of a vector.

question

distance

answer

The length of a position vector is the ___ from the reference point to the object whose position the vector represents

question

reference directions

answer

Maps have two ___, east-west and north-south.

question

reference directions

answer

A two-dimensional map can be drawn as a graph used to represent the location of objects with two ___

question

x-axis. y-axis

answer

East is usually on the positive ___, and north is usually on the positive ___.

question

origin

answer

A location must be chosen to be the reference point, or ___, of the graph.

question

Displacement

answer

___ is the difference between the initial position and the final position of an object.

question

vector

answer

Displacement is measured as a distance from a reference point in a particular direction, and so displacement is a ___.

question

rate

answer

A ___ measures the change in one quantity in a particular length of time

question

Speed

answer

___ is the rate of change of position over a period of time

question

constant speed

answer

An object that moves at a ____ travels the same distance each and every second

question

Instantaneous speed

answer

___, or the speed of an object at a specific instant of time, is especially useful to measure for objects whose speed changes.

question

average speed

answer

An object’s ___ is its total distance traveled divided by the total time it traveled

question

total time

answer

The equation for average speed is average speed = total distance divided by ____.

question

third

answer

If you know any two quantities in the average speed equation, you can use the equation to calculate the ___.

question

distance, m/s

answer

The unit for speed is a ___ unit divided by a time unit. The SI unit for speed is ___

question

Velocity

answer

___ is a measurement of both the speed and direction of motion of an object

question

vector

answer

Velocity is a ___. It has both a size (the speed of the object) and a direction (the direction the object is moving)

question

velocity

answer

Speed is different from ___ because speed does not include the direction in which the object is moving

question

Acceleration

answer

___, another vector, is the rate at which velocity changes over time

question

acceleration

answer

When an object speeds up, the direction of its ___ is the same as the direction of its motion.

question

slows down

answer

When an object ___, its acceleration is in the opposite direction from the direction of its motion

question

accelerating

answer

When an object changes the direction in which it is moving, its velocity changes. This means that it is ___

question

position, x-axis

answer

On a position-time graph, ___ is usually plotted on the y-axis and time is usually plotted on the ___.

question

slope

answer

The ___ of a line is the steepness of the line.

question

slope

answer

On a position-time graph, an object’s speed can be determined by looking at the ___ of the line that represents that object’s motion.

question

faster

answer

On a position-time graph, the steeper the slope of a line, the ___ the object was moving.

question

slower

answer

On a position-time graph, the flatter the slope of the line, the ___ the object was moving

question

rise

answer

The vertical change, or change along the y-axis, on a graph as an object moves between two points is sometimes called the ___.

question

run

answer

The horizontal change, or change along the x-axis, on a graph as an object moves betweentwo points is sometimes called the ___

question

slope

answer

The ___ of a line can be calculated by dividing the rise between two points on the line by the run between the same two points

question

constant

answer

Only objects moving at ___ speeds have straight line position-time graphs

question

starting, ending

answer

The average speed of the entire trip of an object that does not move at constant speed can be calculated by finding the slope between the ___ and ___ data points on the graph of the object’s motion.

question

speed-time

answer

If a ___ graph has a horizontal line, the object whose speed the graph represents was moving at a constant speed.

question

increasing

answer

If an object speeds up, its line on a speed-time graph curves up to the right. The steeper the slope, the faster its speed is ___.

question

slows down

answer

When an object ___, its line on a speed-time graph slopes down to the right

8th grade physical science: chapter 1: Motion – Flashcards

Unlock all answers in this set

Haven't found what you were looking for?

Search for samples, answers to your questions and flashcards